(19)
(11) EP 0 976 650 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
05.06.2002 Bulletin 2002/23

(43) Date of publication A2:
02.02.2000 Bulletin 2000/05

(21) Application number: 99115003.8

(22) Date of filing: 30.07.1999
(51) International Patent Classification (IPC)7: B64C 3/20, B64C 3/18, B64C 3/26
(84) Designated Contracting States:
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
Designated Extension States:
AL LT LV MK RO SI

(30) Priority: 30.07.1998 JP 21541398

(71) Applicants:
  • FUJI JUKOGYO KABUSHIKI KAISHA
    Tokyo-To (JP)
  • JAPAN AIRCRAFT DEVELOPMENT CORPORATION
    Minato-ku, Tokyo-To (JP)

(72) Inventors:
  • Hirahara, Makoto
    Toranomon 1-2-3, Minato-ku, Tokyo-to (JP)
  • Isano, Yasuo
    Shinjuku-ku, Tokyo-to (JP)
  • Shimizu, Ryuhei
    Shinjuku-ku, Tokyo-to (JP)
  • Amaoka, Kazuaki
    Shinjuku-ku, Tokyo-to (JP)

(74) Representative: Sajda, Wolf E., Dipl.-Phys. et al
MEISSNER, BOLTE & PARTNER Widenmayerstrasse 48
80538 München
80538 München (DE)

   


(54) Composite aircraft structures and their fabrication methods


(57) A box-structure airfoil is constructed of a composite material upper skin (11), a composite material lower skin (12) and a spar (13). Ribs (14) and an elongate projection are formed integrally on the inner surface of each of the two skins (11,12). The upper and lower skins (11,12) and the spar (13) are simultaneously bonded by an adhesive to form a single structure. Since the ribs (14) and the elongate projection are one-piece formed with each skin (11,12), it is possible to reduce the number of principal constituent components. Furthermore, since assembly operation is made by using the adhesive, there is no need for fasteners or the like for assembling. Moreover, the spar (13) is bonded not only to, moreover, because not only a web but also flanges on both sides of the spar are bonded to the respective skins (11,12), it is possible to obtain a large strength. According to the invention, it is possible to reduce the number of principal constituent components and that of assembling components of an airfoil, thereby achieving its cost reduction.






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